<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
            ></el-alert>
            <!-- 步骤条 -->
            <el-steps
                :space="200"
                :active="+activeIndex"
                finish-status="success"
                align-center
            >
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form
                :model="addForm"
                :rules="addFormRules"
                ref="addFormRef"
                label-width="100px"
                label-position="top"
            >
                <!-- tabs标签页 -->
                <el-tabs
                    tab-position="left"
                    v-model="activeIndex"
                    :before-leave="beforeTabLeave"
                    @tab-click="tabClick"
                >
                    <el-tab-pane
                        label="基本信息"
                        name="0"
                    >
                        <el-form-item
                            label="商品名称"
                            prop="goods_name"
                        >
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item
                            label="商品价格"
                            prop="goods_price"
                        >
                            <el-input
                                v-model="addForm.goods_price"
                                type="number"
                            ></el-input>
                        </el-form-item>
                        <el-form-item
                            label="商品重量"
                            prop="goods_weight"
                            type="number"
                        >
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item
                            label="商品数量"
                            prop="goods_number"
                            type="number"
                        >
                            <el-input v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item
                            label="商品分类"
                            prop
                        >
                            <el-cascader
                                :options="cateList"
                                :props="cateProps"
                                v-model="addForm.goods_cat"
                                @change="handleChange"
                                clearable
                            ></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane
                        label="商品参数"
                        name="1"
                    >
                        <!-- 渲染表单的item项 -->
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in manyTableDate"
                            :key="item.attr_id"
                        >
                            <!-- 复选框 -->
                            <el-checkbox
                                v-model="item.attr_vals"
                                :label="item1"
                                border
                                size="medium"
                                v-for="(item1, i) in item.attr_vals"
                                :key="i"
                            ></el-checkbox>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane
                        label="商品属性"
                        name="2"
                    >
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in onlyTableDate"
                            :key="item.attr_id"
                        >
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane
                        label="商品图片"
                        name="3"
                    >
                        <!-- action表示图片要上传的地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                        >
                            <el-button
                                size="small"
                                type="primary"
                            >点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane
                        label="商品内容"
                        name="4"
                    >
                        <!-- 富文本编辑器 -->
                        <quill-editor
                            v-model="addForm.goods_introduce"
                            deep
                        />
                        <el-button
                            type="primary"
                            @click="add"
                        >添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览的对话框 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewDialogVisible"
            width="50%"
        >
            <img
                :src="previewPath"
                alt
                class="previewImg"
            />
        </el-dialog>
    </div>
</template>
 
<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 添加表单对象
            addForm: {
                goods_name: '',
                goods_price: null,
                goods_weight: null,
                goods_number: null,
                // 商品所属的分类数组
                goods_cat: [],
                // 上传的图片临时路径（对象
                pics: [],
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
                goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
                goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
                goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
                goods_cat: [{ required: true, message: '请选择', trigger: 'blur' }],
            },
            // 商品分类列表
            cateList: [],
            cateProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                // multiple: true,
                checkStrictly: false
            },
            // 动态参数的数据
            manyTableDate: [],
            // 静态属性的数据
            onlyTableDate: [],
            // 上传图片的URL地址
            uploadURL: 'http://39.104.96.29:8801/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewDialogVisible: false
        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories');
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败');
            }
            this.cateList = res.data;
        },
        // 选择项发生变化触发这个函数
        handleChange() {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类');
                return false;
            }
        },
        async tabClick() {
            // this.activeIndex === '1'，说明点击的是商品参数面板
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(`categories/${this.cataId}/attributes`, {
                    params: { sel: 'many' }
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败');
                }
                res.data.forEach(item => {

                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                })
                this.manyTableDate = res.data;
            }
            // this.activeIndex === '2'，说明点击的是商品属性面板
            if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cataId}/attributes`, {
                    params: { sel: 'only' }
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性列表失败');
                }
                this.onlyTableDate = res.data;
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewDialogVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => {
                x.pic === filePath
            });
            // 3.调用数组的splice方法，把图片信息对象从pics数组中移除
            this.addForm.pics.splice(i, 1);
        },
        handleSuccess(response) {
            // 1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo);
        },
        // 添加商品
        async add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项');
                }
                // 深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableDate.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo);
                })
                // 静态属性
                this.onlyTableDate.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo);
                })
                form.attrs = this.addForm.attrs;
                // 发起请求，添加商品
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败');
                }
                this.$message.success('添加商品成功');
                this.$router.push('/goods');
            })
        }
    },
    computed: {
        // 三级分类的id
        cataId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2];
            }
            return null;
        }
    },
}
</script>
 
<style lang="less" scoped>
.el-steps {
    margin: 20px 0;
}
.el-step {
    font-size: 14px;
}
.el-cascader {
    width: 30%;
}
.el-checkbox {
    margin: 0 10px 10px 0 !important;
}
.previewImg {
    width: 100%;
}
.el-button {
    margin-top: 15px;
}
</style>